Hi
My Hauppauge USB Tune3r worked under Libreelec on RPI 8.0.2. It's a dual tuner and both worked
I've updated to 8.2.0.1 and now only one tuner works. I can understand the problems so I'm hanging back with the older version on an old SD card 
I did a dmesg tail on the the new installation and got the output below.
[ 9.038168] em28xx 1-1.4.1.3:1.0: Identified as Hauppauge WinTV-dualHD DVB (card=99)
[ 9.041917] tveeprom: Hauppauge model 204109, rev B3I6, serial# 13963258
[ 9.041926] tveeprom: tuner model is SiLabs Si2157 (idx 186, type 4)
[ 9.041930] tveeprom: TV standards PAL(B/G) NTSC(M) PAL(I) SECAM(L/L') PAL(D/D1/K) ATSC/DVB Digital (eeprom 0xfc)
[ 9.041933] tveeprom: audio processor is None (idx 0)
[ 9.041936] tveeprom: has no radio, has IR receiver, has no IR transmitter
[ 9.041945] em28xx 1-1.4.1.3:1.0: dvb set to isoc mode.
[ 9.042054] usbcore: registered new interface driver em28xx
[ 9.063799] WARNING: You are using an experimental version of the media stack.
[ 9.063799] As the driver is backported to an older kernel, it doesn't offer
[ 9.063799] enough quality for its usage in production.
[ 9.063799] Use it with care.
[ 9.063799] Latest git patches (needed if you report a bug to [email protected]
[ 9.063799] a83dbc951051ded0ec728f65cc918b7320600b55 Remove unused stv6120 headers.
[ 9.086627] em28xx 1-1.4.1.3:1.0: Binding DVB extension
[ 9.125782] i2c i2c-4: Added multiplexed i2c bus 5
[ 9.125793] si2168 4-0064: Silicon Labs Si2168-B40 successfully identified
[ 9.125797] si2168 4-0064: firmware version: B 4.0.2
[ 9.131023] si2157 5-0060: Silicon Labs Si2147/2148/2157/2158 successfully attached
[ 9.131051] dvbdev: DVB: registering new adapter (1-1.4.1.3:1.0)
[ 9.131060] em28xx 1-1.4.1.3:1.0: DVB: registering adapter 0 frontend 0 (Silicon Labs Si2168)...
[ 9.134564] em28xx 1-1.4.1.3:1.0: DVB extension successfully initialized
[ 9.134574] em28xx: Registered (Em28xx dvb Extension) extension
[ 9.142958] WARNING: You are using an experimental version of the media stack.
[ 9.142958] As the driver is backported to an older kernel, it doesn't offer
[ 9.142958] enough quality for its usage in production.
[ 9.142958] Use it with care.
[ 9.142958] Latest git patches (needed if you report a bug to [email protected]
[ 9.142958] a83dbc951051ded0ec728f65cc918b7320600b55 Remove unused stv6120 headers.
[ 9.145367] em28xx 1-1.4.1.3:1.0: Registering input extension
[ 9.145653] rc rc0: 1-1.4.1.3:1.0 IR as /devices/platform/soc/http://3f980000.usb/usb1/1-1/1-1.4….1.3:1.0/rc/rc0
[ 9.174857] Registered IR keymap rc-hauppauge
[ 9.175322] input: 1-1.4.1.3:1.0 IR as /devices/platform/soc/http://3f980000.usb/usb1/1-1/1-1.4…0/rc/rc0/input2
[ 9.175544] em28xx 1-1.4.1.3:1.0: Input extension successfully initalized
[ 9.175549] em28xx: Registered (Em28xx Input Extension) extension
[ 9.415008] FAT-fs (sdb3): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.
[ 10.703783] si2168 4-0064: downloading firmware from file 'dvb-demod-si2168-b40-01.fw'
[ 10.910459] si2168 4-0064: firmware version: B 4.0.11
[ 10.913196] em28xx 1-1.4.1.3:1.0: DVB: adapter 0 frontend 0 frequency 0 out of range (42000000..870000000)
I know updates raise endless technical issues for developers but maybe there will be an update at sometime that can help.
Kind regards